US4296177A - Flexible graphite sheet, material or layer containing metal molybdate - Google Patents
Flexible graphite sheet, material or layer containing metal molybdate Download PDFInfo
- Publication number
- US4296177A US4296177A US06/106,167 US10616779A US4296177A US 4296177 A US4296177 A US 4296177A US 10616779 A US10616779 A US 10616779A US 4296177 A US4296177 A US 4296177A
- Authority
- US
- United States
- Prior art keywords
- layer material
- molybdate
- metal
- graphite layer
- solubility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 title claims abstract description 50
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 45
- 239000010439 graphite Substances 0.000 title claims abstract description 45
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 23
- 239000002184 metal Substances 0.000 title claims abstract description 23
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 230000007797 corrosion Effects 0.000 claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 23
- 239000003112 inhibitor Substances 0.000 claims abstract description 16
- 150000003839 salts Chemical class 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- -1 alkali metal molybdate Chemical class 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 4
- FQNGWRSKYZLJDK-UHFFFAOYSA-N [Ca].[Ba] Chemical compound [Ca].[Ba] FQNGWRSKYZLJDK-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims 1
- 239000010410 layer Substances 0.000 description 28
- 239000011888 foil Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000012856 packing Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000011684 sodium molybdate Substances 0.000 description 4
- 235000015393 sodium molybdate Nutrition 0.000 description 4
- TVXXNOYZHKPKGW-UHFFFAOYSA-N sodium molybdate (anhydrous) Chemical compound [Na+].[Na+].[O-][Mo]([O-])(=O)=O TVXXNOYZHKPKGW-UHFFFAOYSA-N 0.000 description 4
- RCMWGBKVFBTLCW-UHFFFAOYSA-N barium(2+);dioxido(dioxo)molybdenum Chemical compound [Ba+2].[O-][Mo]([O-])(=O)=O RCMWGBKVFBTLCW-UHFFFAOYSA-N 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- RQPZNWPYLFFXCP-UHFFFAOYSA-L barium dihydroxide Chemical compound [OH-].[OH-].[Ba+2] RQPZNWPYLFFXCP-UHFFFAOYSA-L 0.000 description 1
- 229910001863 barium hydroxide Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K3/1003—Pure inorganic mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/536—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite based on expanded graphite or complexed graphite
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0204—Elements
- C09K2200/0208—Carbon
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/02—Inorganic compounds
- C09K2200/0239—Oxides, hydroxides, carbonates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer
Definitions
- the invention relates to a flexible graphite layer material which contains non-graphitic corrosion inhibitors.
- a flexible graphite layer material containing a metal molybdate with a solubility in water of 10 -2 to 10 -4 g/100 ml to inhibit corrosion.
- a method for the manufacture of a graphite layer material to incorporate a corrosion inhibitor which comprises immersing the graphite layer material in a first solution containing an alkali metal molybdate, subsequently drying the immersed layer material, immersing the dried material in a second solution containing a highly soluble salt of a metal to produce a molybdate of said metal from said soluble salt, said metal being selected that the metal molybdate has a solubility in water of 10 -2 to 10 -4 g/100 ml, and subsequently drying the graphite layer material leaving incorporated therein a metal molybdate of defined said solubility as a corrosion inhibitor.
- this corrosion problem is solved with a flexible graphite layer material which contains one or a plurality of molybdates, the solubility of which in water is 10 -2 to 10 -4 g/100 ml.
- the graphite layer material preferably contains one or more molybdates from the group silver, calcium, barium molybdate.
- a particularly favorable effect is obtained with a graphite layer material having a molybdate content of 0.5 to 1.0% by weight of the graphite layer material.
- the invention is based on the insight that the solubility of the alkali metal salts of the VI A group(Cr, Mo, W) of the periodic system, used heretofore as corrosion inhibitors in graphite layer materials is excessive under certain conditions.
- Other salts such as strontium, zinc, cadmium or tin molybdate, exhibit too little solubility to still achieve an inhibiting effect. It has now been found that these disadvantages can be avoided with molybdate salts having a solubility in water between 10 -2 and 10 -4 g/100 ml. These salts exhibit a solubility which is sufficient to suppress corrosion but is not so large that they are dissolved from the graphite layer material completely during the normal operating life of, for instance, a packing.
- the molybdates in powder form are mixed with expanded graphite particles and the mixture is pressed into foils or similar flexible shapes.
- the molybdates are mixed with a graphite compound such as graphite hydrogen sulfate. This mixture is heated to form expanded graphite particles, and is formed subsequently into flexible planar structures.
- Preferred is a method, in which flexible graphite layer material is immersed in an aqueous solution of an alkali metal molybdate, for instance, sodium molybdate and is taken after interim drying into a second solution which contains one or more highly soluble salts from the group consisting of silver, calcium- and barium salts.
- Suitable salts for the second impregnating solution are, for example, silver nitrate, calcium hydroxide or barium hydroxide.
- the solutions desirably contain about 1% salts and the immersion time for each impregnating solution may be about 30 minutes for foil tapes 0.5 mm thick and with a raw density of about 0.7 g/cm 3 .
- the distribution of the impregnating medium can be improved and the impregnating time reduced, if the impregnation is carried out at a pressure as low as possible and the pressure in the impregnating tank is subsequently increased.
- Graphite foil with a raw or bulk density of 0.7 g/cm 3 and a foil thickness of 0.5 mm was placed in the form of a roll in an impregnating tank and the tank was evacuated to a pressure of about 10 -3 bar. After a degassing time of 15 minutes, the valve to the vacuum pump was shut. An aqueous solution containing 0.8% sodium molybdate was drawn into the tank and the pressure was then increased to about 10 bar. After a holding time of about 15 minutes, the foil was dried in a vacuum dryer at a temperature of about 110° C. and a pressure of about 10 -2 bar for two hours and then replaced in the impregnating tank. The cycle began over again; and aqueous barium nitrate solution with about 1% salt was used as the second impregnating medium. At the end of the cycle, the dried foil contained about 1% barium molybdate.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Laminated Bodies (AREA)
- Ceramic Products (AREA)
- Carbon And Carbon Compounds (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2902252A DE2902252C2 (de) | 1979-01-20 | 1979-01-20 | Flexibler Graphitschichtstoff und Verfahren zu seiner Herstellung |
| DE2902252 | 1979-01-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US4296177A true US4296177A (en) | 1981-10-20 |
Family
ID=6061075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US06/106,167 Expired - Lifetime US4296177A (en) | 1979-01-20 | 1979-12-21 | Flexible graphite sheet, material or layer containing metal molybdate |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4296177A (de) |
| EP (1) | EP0013694B1 (de) |
| JP (1) | JPS6058162B2 (de) |
| CA (1) | CA1136931A (de) |
| DE (1) | DE2902252C2 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4532045A (en) * | 1982-07-07 | 1985-07-30 | Waterscience, Inc. | Bleed-off elimination system and method |
| US20060286025A1 (en) * | 1999-11-26 | 2006-12-21 | Timcal Ag | Process for the production of graphite powders of increased bulk density |
| US20110156352A1 (en) * | 2009-12-24 | 2011-06-30 | Stephen Peter Bond | Gasket |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2560334B1 (fr) * | 1984-02-24 | 1988-03-25 | Latty Cyril | Garniture d'etancheite et ruban permettant sa realisation |
| JP3007598U (ja) * | 1994-07-12 | 1995-02-21 | 富男 福原 | ゴルフボールホルダ |
| US5503438A (en) * | 1995-02-10 | 1996-04-02 | Swauger; Jonathan L. | Flared tube coupling having a disposable sealing boot |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2748135A1 (de) * | 1977-10-27 | 1979-05-03 | Sigri Elektrographit Gmbh | Flexibler graphitschichtstoff |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1194766A (en) * | 1968-06-26 | 1970-06-10 | Dow Chemical Co | Hyperconductive Graphite Structures |
| DE1771821A1 (de) * | 1968-07-17 | 1972-02-03 | Dow Chemical Co | Verfahren zur Herstellung von Graphit-Strukturen niedriger Dichte |
-
1979
- 1979-01-20 DE DE2902252A patent/DE2902252C2/de not_active Expired
- 1979-10-23 EP EP79104097A patent/EP0013694B1/de not_active Expired
- 1979-12-21 US US06/106,167 patent/US4296177A/en not_active Expired - Lifetime
-
1980
- 1980-01-09 CA CA000343340A patent/CA1136931A/en not_active Expired
- 1980-01-17 JP JP55004072A patent/JPS6058162B2/ja not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2748135A1 (de) * | 1977-10-27 | 1979-05-03 | Sigri Elektrographit Gmbh | Flexibler graphitschichtstoff |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4532045A (en) * | 1982-07-07 | 1985-07-30 | Waterscience, Inc. | Bleed-off elimination system and method |
| US20060286025A1 (en) * | 1999-11-26 | 2006-12-21 | Timcal Ag | Process for the production of graphite powders of increased bulk density |
| US20110156352A1 (en) * | 2009-12-24 | 2011-06-30 | Stephen Peter Bond | Gasket |
| US9551422B2 (en) | 2009-12-24 | 2017-01-24 | Flexitallic Investments, Inc. | Gasket |
| US9885435B2 (en) | 2009-12-24 | 2018-02-06 | Flexitallic Investments, Inc. | Gasket |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2902252A1 (de) | 1980-07-24 |
| EP0013694B1 (de) | 1981-11-25 |
| DE2902252C2 (de) | 1983-11-17 |
| CA1136931A (en) | 1982-12-07 |
| JPS55100210A (en) | 1980-07-31 |
| EP0013694A1 (de) | 1980-08-06 |
| JPS6058162B2 (ja) | 1985-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: SIGRI ELEKTROGRAPHIT GMBH, AUGSBURG, GERMANY A COR Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:FREUNDLINGER ERNST;HIRSCHVOGEL ALFRED;REEL/FRAME:003847/0193 Effective date: 19791210 |
|
| STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
| AS | Assignment |
Owner name: SGL TECHNIK GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SGL CARBON AG;REEL/FRAME:009178/0474 Effective date: 19941221 |